i have an 06 6.0L. f350 south Texas truck it starts really hard into the 30s and below. i just moved to maine.
i keep it plugged in all winter still starts extremely hard with lots of chugs and a little smoke. i don't thing my glow plugs are getting heat it takes them about 30sec to a minute for the light to go off. how do i tell if there heated and what is the glow plug resonator. any help would be appreciated thanks, Matt

It is a guess without a monitor. Your glow plugs wil stay on for up to 2 min, depending on conditions. So, here's my guess, your ficm is the problem, load test batteries, perform ficm check procedure. Bad batteries kill ficms. Alot of us are using rotella t6 with good results. Make sure you are using motorcraft or racor filters with matching cap.

You should have DTCs if a glow plug is bad. Do a search for your cold hard start problem; there are lots of reasons, but frequently comes down to FICM if you are not getting codes. You need to get it scanned or buy a scan tool/monitor to find out.

Search 6.0l glow plug check you will find some good info here and elsewhere.

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